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Diffstat (limited to 'src/emu/cpu/rsp/vabs.h')
-rw-r--r-- | src/emu/cpu/rsp/vabs.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/emu/cpu/rsp/vabs.h b/src/emu/cpu/rsp/vabs.h new file mode 100644 index 00000000000..273841b9610 --- /dev/null +++ b/src/emu/cpu/rsp/vabs.h @@ -0,0 +1,15 @@ +// license:BSD-3-Clause +// copyright-holders:Tyler J. Stachecki,Ryan Holtz + +inline rsp_vec_t vec_vabs(rsp_vec_t vs, rsp_vec_t vt, rsp_vec_t zero, rsp_vec_t *acc_lo) +{ + rsp_vec_t vs_zero = _mm_cmpeq_epi16(vs, zero); + rsp_vec_t sign_lt = _mm_srai_epi16(vs, 15); + rsp_vec_t vd = _mm_andnot_si128(vs_zero, vt); + + // Careful: if VT = 0x8000 and VS is negative, + // acc_lo will be 0x8000 but vd will be 0x7FFF. + vd = _mm_xor_si128(vd, sign_lt); + *acc_lo = _mm_sub_epi16(vd, sign_lt); + return _mm_subs_epi16(vd, sign_lt); +} |